There are various kinds of the self - oscillations in the preamplifier system of the high power laser facility , the origins of them were analyzed in theory 摘要分析了高功率激光装置预放大系统内外各种自激振荡的来源，通过理论计算和实验验证提出了各种自激振荡的抑制方法，并在实践中得到验证。
The multi - pass amplification of laser is widely used in high power laser system as the driver of nuclear fusion , for it can improve system efficiency effectively and reduce manufacturing cost 多程放大系统由于能够有效地提高系统效率、降低系统造价，被广泛地应用于的作为核聚变驱动器的高功率激光系统中。
In new system the error pa can also amplify the original signal , so the performance of whole amplifier system increases . since rf predistorters used in the new system , the linearity and power efficiency can be enhanced 该技术改变了误差通路中的信号特性，使误差放大器也输出有用信号功率，提高了整个放大系统的性能。
The following conclusions were drawn from : firstly , the working principle of piezoelectric transformers ( pt ) and switch amplifiers are reaseached and their properties are tested 论文的主要内容如下:一、研究了开关放大电路以及压电变压器的工作原理,实验测试压电变压器的工作特性,实现了振动控制系统中功率放大系统的小型化。
The conditions for long distance propagation and self - guiding are given . 3 . an optical amplification system for 10 ps krf laser with polarization multiplexing is developed and the energy of 140 ml is extracted 发展了一种适用于超短脉冲激光的光学偏振放大技术，并应用于10pskrf激光放大系统中，可在有限的激光输出口径内有效地提取激光的输出能量。
Because of the self - control module , the linearization power amplifier system can work steadily in defiance of the changing of temperature , time , input power etc . it makes the system more practicably and expends the use of linearization system 由于加入自适应控制模块,射频电路不受温度、时漂、输入功率等的影响,可始终处于较佳工作状态,这使得整个放大系统更为实用,也更具有拓展价值。
With the sample of the beam in high power multi - pass amplification , the three - dimensional mathematic model had been set up and the calculation method which functions well in solving these mathematic model is got , the computer simulation of the optical path is also realized 通过对多程放大系统的高斯光束进行高密度典型光线取样，建立杂散光及鬼像分析的三维数学模型，进而得出适合于求解这类数学模型的计算方法，实现计算机光路模拟。
The multi - pass amplifier was being adopted proverbially , which could improve the output energy consumedly . but on the other hand the beam quality was degraded by the severe wave - front ' s aberration that exacerbated by multi - passing the beam through the amplifier 多程放大系统因能够较大提高系统的输出能力，故得到较为广泛的应用；但由于多程放大级各类波前误差的相干叠加，使系统输出激光的波前发生比较严重的畸变，导致光束质量的下降。
Presently , the laser pulse from the high power ultrashort laser system is several femtoseconds in duration , tw ( or pw ) level in peak power , 1020 w / cm2 ( or 1021 w / cm2 ) in focusing power density , according electric field is much stronger than coulomb field in atoms 目前，高功率超短脉冲激光放大系统输出的激光，脉宽达到几个飞秒，峰值功率达到太瓦甚至拍瓦量级，聚焦功率密度达10 ~ 20w cm ~ 2 ，甚至1021w cm2 ，相应的电场比原子内库仑场强得多。
The software meet the need of analysis and calculation of ghost images in multi - pass amplification , its analytic result direct apply the optical design of laser multi - pass amplification . it can reduce the time and cost of optical design and have actual significance 本课题所产生软件能满足多程放大系统不同要求的鬼像分析计算，其分析成果直接应用于激光多程放大系统的设计，对于缩短设计周期、提高光束质量、降低装置造价，具有重要意义及明确的应用前景。
